Is there any other way to prove angle sum property of triangle except by parallel line property and exterior angle property?

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Derive the angle sum property of the triangle using the exterior angle property of the triangle. [4 MARKS]

State and prove the Angle Sum Property of a triangle .

Q. Assertion : Exterior angle bisector property Reason: Prove of interior angle bisector property

Q. When we formally prove the angle sum property of a triangle then we need to draw a line parallel to the base of triangle.. why this is so?any particular reason??

(a) Derive the angle sum property of the triangle using the exterior angle property.

(b) AE is the angular bisector. $∠ 4 = 140^{\circ}, ∠ 2 = 60^{\circ}, ∠ E A C = x$ . Find $x$ .

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